Winbond Electronics Corporation W66CM2NQUAFJ

Overview

W66CM2NQUAFJ from Winbond Electronics is a 4Gb LPDDR4X SDRAM in WFBGA-200 package, operating at 4266 Mbps data rate with 1.1 V I/O and 0.6 V core supply. It supports dual-die-package (DDP) architecture, on-die termination (ODT), ZQ calibration, and temperature-sensor-assisted refresh for mobile and embedded applications requiring high bandwidth and low power.

For engineers reviewing the W66CM2NQUAFJ datasheet, W66CM2NQUAFJ pinout, W66CM2NQUAFJ application, or W66CM2NQUAFJ equivalent, this page provides verified electrical specs, ball assignment, mode register configuration, LPDDR4X timing compliance, and validated alternative options for memory subsystem design.

Technical Context

This device implements LPDDR4X JEDEC standard JESD209-4B, supporting 16-bit x2-channel interface with 8 internal banks per die and dual-rank DDP topology. It features programmable MR registers (MR0–MR40), CA/DQ VREF training, command bus training, and write leveling for signal integrity at 2133 MHz clock frequency.

Power management includes deep power-down, self-refresh with thermal offset compensation, TRR (Target Row Refresh), and Post-Package Repair (PPR). Timing parameters include tCK = 0.234 ns (4266 Mbps), tRCD = 16 ns, tRP = 16 ns, and tRFC = 350 ns - all specified across commercial temperature range (0°C to +85°C).

Key Specifications

Pinout & Package

W66CM2NQUAFJ uses a 200-ball WFBGA package with 16-bit dual-channel interface (x2 × 16-bit), organized as two independent 100-ball sub-arrays for DDP configuration. Ball assignment follows JEDEC-standard LPDDR4X layout with dedicated VSS/VDD pairs, differential clocks (CK_t/CK_c), and per-channel DQS/DQ/DM groups.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LPDDR4X memory applications.

Compared with W66CM2NQUAFJ, MT53E256M32D2DS-046 offers broader distributor availability but requires layout redesign, while K4UH3S44AM-BCGC matches footprint and speed but omits PPR and thermal sensing - making W66CM2NQUAFJ optimal for long-lifecycle, safety-critical, or thermally constrained deployments.

Availability

W66CM2NQUAFJ is available at Aetrix Electronics and suitable for smartphone application processor memory, automotive ADAS domain controllers, and industrial edge AI gateways requiring stable component supply, long-term lifecycle support, and JEDEC-compliant LPDDR4X performance.

Supply support for W66CM2NQUAFJ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Winbond Electronics is a Taiwan-based semiconductor company specializing in specialty memory solutions, including SPI NOR Flash, RAM, and mobile DRAM, with ISO/TS 16949 certification for automotive-grade products.

W66CM2NQUAFJ belongs to Winbond's LPDDR4X product line, designed specifically for power-constrained, high-bandwidth mobile and embedded systems demanding JEDEC-compliant low-voltage operation and advanced reliability features.

FAQ

What is the maximum data rate supported by W66CM2NQUAFJ?

W66CM2NQUAFJ supports a maximum data rate of 4266 Mbps, corresponding to a 2133 MHz clock frequency. This is confirmed in the AC timing tables of the official datasheet (Rev. A01-003, Section 8.2.4), with tCK = 0.234 ns and full compliance to JEDEC JESD209-4B LPDDR4X specifications. The W66CM2NQUAFJ achieves this rate using 1.1 V VDDQ and optimized signal integrity features including DQS gating and write leveling.

Does W66CM2NQUAFJ support dual-die-package (DDP) configuration?

Yes, W66CM2NQUAFJ is explicitly designated as a Dual-Die-Package (DDP) device in the datasheet title and Section 4.2, integrating two 2Gb dies in a single WFBGA-200 package. This configuration delivers 4Gb density while maintaining pin compatibility with single-die variants, enabling scalable memory capacity without PCB redesign. The W66CM2NQUAFJ DDP architecture supports independent rank operation and per-die refresh control.

What power supply voltages does W66CM2NQUAFJ require?

W66CM2NQUAFJ requires three distinct supply rails: VDD/VDDQ = 1.1 V ±3% for I/O and interface circuits, VDD2 = 0.6 V ±3% for core logic and memory array, and VSS as ground reference. These values are specified in Section 8.2.1 of the datasheet (Rev. A01-003) and are mandatory for stable operation at 4266 Mbps. Deviation beyond tolerance risks timing violation or initialization failure in the W66CM2NQUAFJ.

Is W66CM2NQUAFJ compatible with LPDDR4 controllers?

No, W66CM2NQUAFJ is not backward-compatible with standard LPDDR4 controllers. It implements LPDDR4X-specific enhancements including lower 1.1 V I/O voltage, updated VREFDQ training sequences, and WDQS control modes defined in JESD209-4B. Controllers must explicitly support LPDDR4X mode - attempting to initialize W66CM2NQUAFJ in LPDDR4 mode will result in initialization timeout or bus contention.

Does W66CM2NQUAFJ include built-in error correction or redundancy?

W66CM2NQUAFJ does not implement on-die ECC, but it supports Post-Package Repair (PPR) as described in Section 7.4.48 of the datasheet. PPR allows permanent repair of defective rows using factory-programmed redundancy, enhancing field reliability without requiring external ECC logic. This capability is unique to the W66CM2NQUAFJ among mainstream 4Gb LPDDR4X offerings and is activated during manufacturing test or system-level initialization.